Horizontal Sight Angle (EN 17037) Extension

Introduction

The Horizontal Sight Angle is the measurement at a point of the viewing angle towards the outside. The openings are the windows looking towards the exterior of the building. The horizontal sight angle of a room completely closed is 0°, the horizontal sight angle of a flat surface without any wall around is 360°.

The Horizontal Sight Angle indicator is used by the European standard EN 17037 (in UK: BS EN 17037:2018 Daylight in buildings).

DL-Light extension Horizontal Sight Angle

This extension is designed to follow the recommendations of the standard:


How to use Horizontal Sight Angle (EN 17037) Extension

Important: layers corresponding to glazing must be hidden.

  1. Open SketchUp model. Follow recommendations to prepare your model for DL-Light calculations.

  2. Open Horizontal Sight Angle dialog from toolbar hsa 17037 icon or menu Extensions -> De Luminae -> Horizontal Sight Angle (EN 17037) -> Horizontal Sight Angle (EN 17037) computation and enter the parameters of the calculation.

    DL-Light extension Horizontal Sight Angle 17037 General tab
    DL-Light extension Horizontal Sight Angle 17037 General tab

    Fields description:

  3. The palette of false colors uses the thresholds of the standard. It is possible to change the different colors.

    DL-Light extension Horizontal Sight Angle Panel tab
  4. After entering the parameters, select surfaces and press Render or run_selected button.

    DL-Light extension Horizontal Sight Angle selection

    Calculation time depends on number of selected surfaces and model complexity.

  5. When results are imported, selected surface will have appropriate false colors and Palette and Report dialogs will be opened.

    DL-Light extension Horizontal Sight Angle 17037 result 1

    Result for the 'Surface threshold' mode:

    DL-Light extension Horizontal Sight Angle 17037 result 2
  6. Results analysis.

  7. For further calculations in the same model:

    Since version 8.0, DL-Light uses a calculation cache algorithm. It automatically detects if a surface requires recalculation or if a previous result can be reused. By default, the cache keeps the information of the last 10 calculations (value configurable in the preferences).

  8. Archiving results:

    DL-Light allows to archive all the results of a calculation: reports, textures and calculation steps (exported Radiance model ...). This archive can be reloaded on the model, subject to using exactly the same model as during the calculation.

    See the page Archiving results for more informations about this feature.

    See the page Comparison of results for more informations about comparison of several archives.

  9. Snapshots:

    Current SketchUp model view with imported results can be exported with palette snapshot_with_palette_icon or without palette snapshot_icon to png format. Open the folder of images with open_snapshot_folder_icon.
    This option is not supported in trial version of the extension (see licence information).

    DL-Light extension Horizontal Sight Angles snapshot image